Ozone Transport-Radiation Feedbacks in the Tropical Tropopause Layer
Ozone Transport-Radiation Feedbacks in the Tropical Tropopause Layer
复制标题
DOI：
10.1029/2019gl084679
复制
发表时间：
2019-12-12
影响因子：
5.2
通讯作者：
Albers, John R.
中科院分区：
文献类型：
--
作者：
Charlesworth, Edward J.;Birner, Thomas;Albers, John R.
热带对流层顶层(TTL)温度平衡因其控制进入平流层的水量而具有相当大的意义。布鲁尔-多布森环流(BDC)的上升支通过绝热冷却直接影响这些温度。BDC上升流还通过臭氧输送对辐射加热的影响间接影响TTL温度。我们使用单柱辐射-对流平衡模式和简化的平流层臭氧化学和垂直输送模式来研究后一种反馈。我们发现BDC臭氧输送对TTL温度具有一阶重要性。此外，我们估计了臭氧输送对冷点对流层顶温度对上升流变化的响应的影响。我们发现，在长于半年的时间尺度上，反馈对扰动的响应约占20%，但对于小于一周的时间尺度，这一贡献可以忽略不计。
The tropical tropopause layer (TTL) temperature balance is of considerable interest for its control over the amount of water entering the stratosphere. The upwelling branch of the Brewer-Dobson circulation (BDC) directly affects these temperatures through adiabatic cooling. BDC upwelling also indirectly affects TTL temperatures through the influence of ozone transport on radiative heating. We investigate this latter feedback using a single-column radiative-convective equilibrium model coupled with a model of simplified stratospheric ozone chemistry and vertical transport. We find that BDC ozone transport is of first-order importance for TTL temperatures. Additionally, we estimate the effect of ozone transport on cold point tropopause temperature responses to changes in upwelling. We find that the feedback is responsible for approximately 20% of the response to perturbations on time scales longer than about half a year but that this contribution can be neglected for time scales shorter than about a week.